Respiratory mask



FIG. 1 is a perspective view of a respiratory mask according to the present invention;

FIG. 2 is a left side elevational view thereof, the right side being a mirror image of the left side;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevational view of an alternative embodiment of the respiratory mask, the right side elevational view of the alternative embodiment being a mirror image of the left side elevational view of the alternative embodiment; and,

FIG. 8 is a top plan view of the alternative embodiment. 

The ornamental design for a respiratory mask, as shown and described. 